Gooding County, ID — Water Intelligence Brief

August 17, 2026 | Free-Tier Edition

Situation Summary

Gooding County enters the late irrigation season with snowpack fully melted out across all monitored headwaters, consistent with the anomalous early-melt pattern that defined the 2026 water year — both the Galena Summit and Lewis Lake Divide SNOTEL stations melted out approximately 4–6 weeks ahead of the historical median meltout date. ESPA spring discharge, as reflected by the Malad River near Gooding, remains the critical near-term supply variable for Hagerman Valley trout aquaculture operators, while dairy and alfalfa producers are managing late-season Snake River canal deliveries under diminishing tributary inflow conditions. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

Both SNOTEL stations monitoring Gooding County's relevant headwater zones report 0.0" snow water equivalent and 0.0" snow depth as of August 16, 2026 — fully consistent with expected late-summer seasonal conditions for this point in the calendar, when median SWE is also 0.0".

Galena Summit (490:ID:SNTL): SWE 0.0", Depth 0.0". This station monitors the Big Wood River headwaters in the Sawtooth Range and is the primary local tributary snowpack indicator for Gooding County. The Big Wood River drains south through the Wood River Valley into the Snake River in the Gooding/Lincoln county area, making Galena Summit directly relevant to late-season tributary inflows in this part of the Magic Valley corridor. In 2026, Galena Summit melted out 4–6 weeks ahead of the historical median meltout date — meaning the Big Wood system exhausted its snowmelt contribution to the Snake River significantly earlier than a typical year.

Lewis Lake Divide: SWE 0.0", Depth 0.0". This station similarly reflects complete melt-out, consistent with the broader early-season pattern across the Magic Valley headwaters.

With both stations at seasonal zero and no further snowmelt contribution possible, Snake River tributary inflows from the Big Wood system are now entirely dependent on late-season base flow and any precipitation events rather than stored snowpack release.

Streamflow Conditions

Malad River near Gooding (USGS 13152500): 137 cfs, rising — August 17, 2026

The Malad River near Gooding is the primary indicator of ESPA spring discharge for the Hagerman Valley. Unlike snowmelt-driven rivers, the Malad River's flow reflects Eastern Snake Plain Aquifer water levels and Thousand Springs spring discharge rates rather than seasonal precipitation — making it a relatively stable, year-round supply signal for Hagerman Valley trout aquaculture operators who depend entirely on spring water appropriations from the ESPA complex.

At 137 cfs and rising, the Malad gauge is currently reporting active flow. The rising trend is a near-term positive signal for trout aquaculture operators, as stable-to-rising spring discharge supports the consistent flow rates and water temperatures that commercial trout operations require. Trout farmers should note, however, that ESPA spring discharge is governed by long-term aquifer conditions rather than immediate precipitation — sustained monitoring of this gauge across weeks and months provides more meaningful supply intelligence than day-to-day fluctuations.

For dairy and alfalfa producers relying on Snake River canal deliveries, the Malad River reading confirms continued ESPA spring contribution to the Snake River baseflow at the western end of the Magic Valley corridor. Snake River mainstem context for canal delivery purposes is inherited from upstream gauges at Milner and Twin Falls, as no active Snake River gauge is located within Gooding County.

Seasonal Guidance

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Data Sources: SNOTEL data through August 16, 2026; USGS streamflow data through August 17, 2026.

Data Current As Of: August 17, 2026. SNOTEL data reported by NRCS National Water and Climate Center. USGS streamflow data reported by the USGS National Water Information System.

Important Disclaimers: This brief provides automated analysis for informational purposes only. Specific numerical claims have not been independently verified. Consult official sources including your local water district, Idaho Department of Water Resources (IDWR — administers Water District 36, the middle Snake River and tributary water rights; also administers separate spring water appropriations for Hagerman Valley trout aquaculture and dairy operations), Idaho Department of Fish and Game (co-manages Thousand Springs State Park area), and U.S. Bureau of Reclamation, Pacific Northwest Region (Boise office — upstream context), for all regulatory decisions and water rights administration.